Remote Code Execution (RCE) is a vulnerability class that lets an attacker execute arbitrary code on a remote system without physical access. RCE vulnerabilities rank among the most critical threats because they frequently lead to full system compromise. Common root causes include insecure deserialisation, buffer overflows, and insufficient input validation. In vulnerability management, RCE findings typically receive the highest CVSS scores. You should prioritise patching known RCE vulnerabilities and isolate affected services until a fix is deployed.